Aleck,

if you click the QUOTE button as though you were going to reply to his original post with quotes, you will see in the source code that his picture was uploaded to an online storage location, and he put it in the message by entering the URL of the picture's location.
{image} http://img268.imageshack.us/img268/451/riffss.jpg {/image}

Perhaps you were trying to load a graphic directly from your computer? The picture has to be located somewhere on the web in order to put it into a message.

Dropbox is one of many places that lets you place photos or other graphics for linking purposes.

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0